A bit of thread necromancy here, but this is a great topic and has been really helpful for me!
I've got all of my UUID's from the Retroplay WHDLoad set all set up and they seem to be working fine, however I'm running into two (related?) issues:
1.) None of my F-keys work in-game. This is a bit annoying for titles that have a menu screen that require you to e.g. press F1 for One Player, F2 for Two player, etc.
2.) Likewise, I'm having trouble figuring out how to define a global close emulator key (for keyboard, not using a controller) in FS-UAE 3.0.5. Under Launcher Settings -> WHDLoad there is an option to set an Override WHDLoad quit key, but the info button says that this option is deprecated and may have conflicts with a newer solution that I have no idea how to use:
Deprecation warning: This option somewhat conflicts with the new
whdload_quit_key option in FS-UAE, so this launcher option might go
away.